linux-kernel - [tip:sched/core] sched/fair: Fix reschedule which is generated on throttled cfs

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Date:	Wed, 20 Aug 2014 01:20:01 -0700
From:	tip-bot for Kirill Tkhai <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, ktkhai@...allels.com, hpa@...or.com,
	mingo@...nel.org, torvalds@...ux-foundation.org,
	peterz@...radead.org, tglx@...utronix.de
Subject: [tip:sched/core] sched/fair:
  Fix reschedule which is generated on throttled cfs_rq

Commit-ID:  f36c019c79edb3a89920afae1b2b45987af1a112
Gitweb:     http://git.kernel.org/tip/f36c019c79edb3a89920afae1b2b45987af1a112
Author:     Kirill Tkhai <ktkhai@...allels.com>
AuthorDate: Wed, 6 Aug 2014 12:06:01 +0400
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 20 Aug 2014 09:47:20 +0200

sched/fair: Fix reschedule which is generated on throttled cfs_rq

(sched_entity::on_rq == 1) does not guarantee the task is pickable;
changes on throttled cfs_rq must not lead to reschedule.

Check for task_struct::on_rq instead.

Signed-off-by: Kirill Tkhai <ktkhai@...allels.com>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/1407312361.8424.35.camel@tkhai
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 1413c44..bc37bb9 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7494,7 +7494,7 @@ static void task_fork_fair(struct task_struct *p)
 static void
 prio_changed_fair(struct rq *rq, struct task_struct *p, int oldprio)
 {
-	if (!p->se.on_rq)
+	if (!p->on_rq)
 		return;
 
 	/*
@@ -7550,15 +7550,15 @@ static void switched_from_fair(struct rq *rq, struct task_struct *p)
  */
 static void switched_to_fair(struct rq *rq, struct task_struct *p)
 {
-	struct sched_entity *se = &p->se;
 #ifdef CONFIG_FAIR_GROUP_SCHED
+	struct sched_entity *se = &p->se;
 	/*
 	 * Since the real-depth could have been changed (only FAIR
 	 * class maintain depth value), reset depth properly.
 	 */
 	se->depth = se->parent ? se->parent->depth + 1 : 0;
 #endif
-	if (!se->on_rq)
+	if (!p->on_rq)
 		return;
 
 	/*
--
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